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Senior Notes (Tables)
 12 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Senior Notes
The 2008 Senior Notes were issued in four series as follows:        
Series
Amount
Interest Rate
Maturity Date
 
(In millions)
 
 
A
$
41.0

6.37
%
May 7, 2013
B
$
40.0

6.37
%
May 7, 2015
C
$
63.0

6.71
%
May 7, 2015
D
$
131.0

7.18
%
May 7, 2018
The 2010 Senior Notes were issued in four series as follows:        
Series
Amount
Interest Rate
Maturity Date
 
(In millions)
 
 
E
$
60.0

4.72
%
July 14, 2016
F
$
72.0

5.04
%
July 14, 2017
G
$
28.0

5.42
%
July 14, 2019
H
$
85.0

5.59
%
July 14, 2020
Principal Amounts Carrying amounts and Fair Values of Senior Notes
The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2017 and 2016: 
 
September 30, 2017

September 30, 2016
 
Carrying
Amounts

Fair Value

Carrying
Amounts (1)

Fair Value (1)
 
(In thousands)
The 2008 Senior Notes
$
131,000


$
134,250


$
131,000


$
139,902

The 2010 Senior Notes
113,000


119,106


185,000


195,715

Debt issuance costs
(199
)
 
(199
)
 
(376
)
 
(376
)
      Total
$
243,801

 
$
253,157

 
$
315,624

 
$
335,241


(1) Balances as of September 30, 2016 have been recast as a result of the adoption of ASU 2015-03 to present debt issuance costs of $0.4 million as a direct deduction from the carrying amount of the Senior Notes.
Future Principal Payments For the Senior Notes
Future principal payments for the Senior Notes are as follows (in thousands):                
Year Ended September 30,
 
2018
$
131,000

2019
28,000

2020
85,000

       Total
$
244,000